I repaired it with two of those chain links that have the threaded sleeve allowing the link to open. I keep inspecting them and they are OK so far. I don't crank down on the mainsheet for sail trim so much now that I have a solid vang. I know I'd like a more sophisticated traveler but at the same time I would not like a lot more hardware to trip over going over the bridge deck...
As long as this jury rigged Shaffer holds up I'm happy. I think I eliminated the weakest parts.